Directives in .NET framework

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Throughout this chapter we have used the @Page directive to control the default language, code-behind class, and implicit assembly compilation of our aspx files In addition to the @Page directive, several other directives are available for use in aspx files, as shown in Table 1-1 Because every aspx file is compiled into a class, it is important to have control over that compilation, just as you would via compiler switches if you were compiling a class yourself These directives give you control over many options that affect the compilation and running of your page
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Table of Contents
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Essential ASPNET with Examples in C#
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ByFritz Onion Publisher Pub Date
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Table 1-1 aspx File Directives
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Directive Name
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Attributes See Table 1-2
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Description Top-level page directive Imports a namespace to a page (similar to the using keyword in C#) Links an assembly to the current page when it is compiled (using src implicitly compiles the file into an assembly first)
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@Page
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: Addison Wesley
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: February 11, 2003
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@Import ISBN
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Namespace : 0-201-76040-1
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@Assembly 432 Name Pages : Src
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@OutputCache Duration Controls output caching for a page (see 9 for more details) "This well-conceived and well-written book has extensive knowledge and priceless experience overflowing from its pages It Location captures the true essence of ASPNET and walks the reader to a high level of technical and architectural skill"-J Fred Maples, Director of Software Engineering, NASDAQcom VaryByCustom
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Essential ASPNET with Examples in C# is the C# programmer's definitive reference for ASPNET through VaryByHeader version 11 It provides experienced programmers with the information needed to fully understand the technology, and is a clear guide to using ASPNET to build robust and well architected Web applications
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VaryByParam
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This book begins with a discussion of the rationale behind the design of ASPNET and an introduction to how it builds on top of VaryByControl the NET framework Subsequent chapters explore the host of new features in ASPNET, including the server-side compilation model, code-behind use within a page (see 8 for more @Register Tagprefix Registers a control for classes, server-side controls, form validation, the data binding model, and custom control development Throughout the book, working examples illustrate details) best practices for Namespace building Web-based applications in C# Among the topics Assembly depth are: explored in
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Tagname Interface Page Control
Adds the specified interface to the list of implemented interfaces for this page Specifies a page or user control that this page should dynamically compile and link to at runtime
@Implements @Reference
Configuration HTTP pipeline
Diagnostics and error handling
The@Assembly directive provides a way for aspx files to reference assemblies that are deployed in the Validation global assembly cache or, using the src attribute, to reference a source file that is compiled and referenced implicitly when the page is referenced The @Import directive serves the same purpose as the using Data binding keyword in C#, which is to implicitly reference types within a specified namespace The @Implements directive givescontrols ability to implement an additional interface in your Page-derived class, and the Custom you the @Reference directive provides a mechanism for referencing the generated assemblies of other pages or user controls Caching To see an example of when you might use some of these directives, suppose we decide to deploy the State management TempConverter class in the global assembly cache so that all the applications on our machine can access
its functionality We also wrap it in a namespace to ensure that there is no clash with other components in [ Team LiB ] our system, and sign it with a public/private key pair Listing 1-14 shows the source file for our TempConverter component Listing 1-14 Source File for TempConverter Component
// File: TempConvertercs using System; using SystemReflection; [assembly : AssemblyKeyFile("pubprivsnk")] [assembly : AssemblyVersion("1000")] namespace EssentialAspDotNetArchitecture { Table of Contents public class TempConverter Essential ASPNET with Examples in C# { ByFritz Onion public double FahrenheitToCentigrade(double val) static { return ((val-32)/9)*5; Publisher : Addison Wesley } Pub Date : February 11, 2003